Overedge-machine.



No. 833,074. PATENTED OCT. 9, 1906. K. MAIER.

OVEREDGE MACHINE.

APPLICATION FILED MAB-.9, 1906.

2 SHEETS-SHEET 1. O

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No. 833,074. PATENTED' OCT. 9, 1906. K. MAIER.

OVEREDGE MACHINE.

YAPPLIOATION FILED MAR. 9, 1906.

2 SHEETS-SHEET 2'- TH! NORRIS ps-rsxs co.. WASHINGTON, n, c.

UNITED STATES PATENT OFFICE.

KARL MAIER, OF STUTTGART, GERMANY, ASSIGNOR TO UNION SPECIAL MASOHINENFABRIK, OF STUTTGART, GERMANY, A CORPORATION.

OVEREDGE-MACHINE.

Specification of Letters Patent.

Patented Oct. 9. 1906.

Original application filed January 18, 1905, Serial No. 241,697. Divided and this application filed March 9, 1906. Serial No. 305.162.

T0 ctZZ whom it may concern.-

Be it known that I, KARL MAIER, a subject of the German Emperor, residing at Stuttgart, in the Kingdom of Wiirtemberg, Empire of Germany, have invented certain new and useful Improvements in Overedge-Machines, of which the following is a description, reference being had to the accompanying drawings and to the letters and figures of reference marked thereon.

This application is a division of my application, Serial No. 241,697, filed January 18, 1905.

My inventionrelates to overedging-machines wherein a needle-thread is carried through the material adjacent the edge thereof, a looper-thread loop is passed through said needle-loop and is in turn enchained directly or indirectly with the next succeeding needle-loop above the fabric.

My invention resides in a thread-detainer Which is operated to engage the looperthread and hold the same close to the path of movement of the looper.

In the drawings, Figure 1 is a front elevation of a portion of an overedging-machine with my improved mechanism attached thereto, the bed-plate being sectioned. Fig. 2 is a detail top perspective of my thread-detainer and its support. Fig. 3 is a front end elevation of the parts shown in Fig. 1, the bed-plate being shown in section; and Fig. 4 is a top perspective of the seam, showing the needle, looper, and detainer in their relation to the same, said view being taken from above, behind, and at the right of the stitching implements.

In the ordinary overedging-machine of the type referred to when the looper enters the needle-loop the looper-thread running to the last-made stitch draws against the needle-loop, causing said loop to be drawn out to considerable size and also causing wear on the threads; By the use of my detainer the looper-loop is held close to the path of the looper and the contact of the looper-thread with the needle-thread is practically avoided. The needle 0, carrying a thread 1, the looper q, carrying a thread 2, the spreader d and its supporting-arm p may be of any desiredconstruction, and as they form no part of my invention as to detail structure they have been shown only in a fragmentary manner.

My improved detainer 0 is carried by a shaft Z, mounted in suitable-spaced bearings m, supported by the bed-plate. The spreader, as shown in the drawings, is mounted loosely on the shank of the detainer-shaft. Connected to the shaft Z between the spaced bearings is an arm K, which in turn is connected by a link i to a bell-crank lever h, pivoted on the frame a and operated from an eccentric g on the main shaft 0 by the link f. By said means the detainer is oscillated in proper timing with the looper, so that as the looper moves forward said detainer engages the looper-thread 2, holding the same close to the shank of the looper and out of contact with the needle-thread 1. Therefore, the needle-loop, sliding easily over the looper, is not enlarged by the strain thereon by the looper-thread running to the last-made stitch, and all wear on the threads by rubbing against each other is avoided. By this freedom of movement of the needle-loop I can make a stitch that is more uniform in character, as where there is a strain on the needle-loop caused by the pulling thereon of the looper-thread the point at which the threads concatenate is rendered uncertain.

Having thus described my invention,what I claim as new, and desire to secure by Letters Patent, is

1. In an overedging-machine, the combination with overedge-stitching mechanism including a thread-carrying looper, means for operating the same, of a detainer, and means for moving said detainer to engage the looper-thread and hold the same adjacent the looper-body; substantially as described.

2. In an overedging-machine, the combination with overedge-stitching mechanism, including a thread-carrying looper, means for operating the same, of a pivoted detainer, and means for oscillating said detainer to engage the looper-thread and hold the same adjacent the looper-body; substantially as described.

3. In an overedging-machine, the combination with a needle, a spreader, a thread-carrying looper, and means for operating the same, of a detainer, and means for operating said detainer to engage the looper-thread and hold the same closely adjacent thelooper-body, and out of contact with the needle-loop; substantially as described.

4. In an overedging-machine, the combination with an overedgestitching mechanism,

including a thread-carrying looper, of a thread-detainer, and means for oscillating said detainer to engage the looper-thread between said looper and the last-made stitch,

and hold said looper-thread adjacent the' looper-body and out of contact With the needle-loop substantially as described.

In testimony whereof I aflix my signature in presence of tWo Witnesses.

KARL MAIER. 

